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package FindExt;
our $VERSION = '1.01';
use strict;
use warnings;
my $no = join('|',qw(GDBM_File ODBM_File NDBM_File DB_File
Syslog SysV Langinfo));
$no = qr/^(?:$no)$/i;
my %ext;
my $ext;
my %static;
sub getcwd {
$_ = `cd`;
chomp;
s:\\:/:g ;
return $ENV{'PWD'} = $_;
}
sub set_static_extensions
{
# adjust results of scan_ext, and also save
# statics in case scan_ext hasn't been called yet.
%static = ();
for (@_) {
$static{$_} = 1;
$ext{$_} = 'static' if $ext{$_} && $ext{$_} eq 'dynamic';
}
}
sub scan_ext
{
my $here = getcwd();
my $dir = shift;
chdir($dir) || die "Cannot cd to $dir\n";
($ext = getcwd()) =~ s,/,\\,g;
find_ext('');
chdir($here) || die "Cannot cd to $here\n";
my @ext = extensions();
}
sub dynamic_ext
{
return sort grep $ext{$_} eq 'dynamic',keys %ext;
}
sub static_ext
{
return sort grep $ext{$_} eq 'static',keys %ext;
}
sub nonxs_ext
{
return sort grep $ext{$_} eq 'nonxs',keys %ext;
}
sub extensions
{
return sort grep $ext{$_} ne 'known',keys %ext;
}
sub known_extensions
{
# faithfully copy Configure in not including nonxs extensions for the nonce
return sort grep $ext{$_} ne 'nonxs',keys %ext;
}
sub is_static
{
return $ext{$_[0]} eq 'static'
}
# Function to recursively find available extensions, ignoring DynaLoader
# NOTE: recursion limit of 10 to prevent runaway in case of symlink madness
sub find_ext
{
opendir my $dh, '.';
my @items = grep { !/^\.\.?$/ } readdir $dh;
closedir $dh;
for my $xxx (@items) {
if ($xxx ne "DynaLoader") {
if (-f "$xxx/$xxx.xs") {
$ext{"$_[0]$xxx"} = $static{"$_[0]$xxx"} ? 'static' : 'dynamic';
} elsif (-f "$xxx/Makefile.PL") {
$ext{"$_[0]$xxx"} = 'nonxs';
} else {
if (-d $xxx && @_ < 10) {
chdir $xxx;
find_ext("$_[0]$xxx/", @_);
chdir "..";
}
}
$ext{"$_[0]$xxx"} = 'known' if $ext{"$_[0]$xxx"} && $xxx =~ $no;
}
}
# Special case: Add in threads/shared since it is not picked up by the
# recursive find above (and adding in general recursive finding breaks
# SDBM_File/sdbm). A.D. 10/25/2001.
# Ditto for IO/Compress/Base and IO/Compress/Zlib
if (!$_[0] && -d "threads/shared") {
$ext{"threads/shared"} = 'dynamic';
}
if (!$_[0] && -d "IO/Compress/Base") {
$ext{"IO/Compress/Base"} = 'nonxs';
}
if (!$_[0] && -d "IO/Compress/Zlib") {
$ext{"IO/Compress/Zlib"} = 'nonxs';
}
}
1;
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